<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>React 菜谱</title>
    <style>
      #root {
  margin: 100px auto;
  width: 50px;
  height: 60px;
  text-align: center;
  font-size: 10px;
}
 
#root > div {
  background-color: #67CF22;
  height: 100%;
  width: 6px;
  display: inline-block;
   
  -webkit-animation: stretchdelay 1.2s infinite ease-in-out;
  animation: stretchdelay 1.2s infinite ease-in-out;
}
 
#root .rect2 {
  -webkit-animation-delay: -1.1s;
  animation-delay: -1.1s;
}
 
#root .rect3 {
  -webkit-animation-delay: -1.0s;
  animation-delay: -1.0s;
}
 
#root .rect4 {
  -webkit-animation-delay: -0.9s;
  animation-delay: -0.9s;
}
 
#root .rect5 {
  -webkit-animation-delay: -0.8s;
  animation-delay: -0.8s;
}
 
@-webkit-keyframes stretchdelay {
  0%, 40%, 100% { -webkit-transform: scaleY(0.4) } 
  20% { -webkit-transform: scaleY(1.0) }
}
 
@keyframes stretchdelay {
  0%, 40%, 100% {
    transform: scaleY(0.4);
    -webkit-transform: scaleY(0.4);
  }  20% {
    transform: scaleY(1.0);
    -webkit-transform: scaleY(1.0);
  }
}
    </style>
  </head>
  <body>
    <div id="root">
      <div class="rect1"></div>
      <div class="rect2"></div>
      <div class="rect3"></div>
      <div class="rect4"></div>
      <div class="rect5"></div>
    </div>
  </body>
</html>
